Tcl Library Source Code
Help: web-browser
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Bounty program for improvements to Tcl and certain Tcl packages.
Tcl 2018 Conference, Houston/TX, US, Oct 15-19
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or submit via the online form by Aug 20.

The "web-browser" setting:

A shell command used to launch your preferred
web browser when given a URL as an argument.
Defaults to "start" on windows, "open" on Mac,
and "firefox" on Unix.